Abstract. Globally healthcare waste has been identified as a major problem that has the potential of impacting negatively on both human health and environment for decades. The study was conducted to assess healthcare waste management practices employed by health workers in health facilities in Bushenyi District western Uganda. The study design adapted was a descriptive and cross sectional type and both quantitative and qualitative methods were used. Twelve out of a total of 38 health facilities present in the district were selected. A range of methods employed for the collection of data included questionnaire survey which targeted 340 stratified randomly selected healthcare workers, formal interviews as well as field observations. The results depicts that majority of the respondents 263 (77.4%) agreed that healthcare waste was been segregated at their facilities while 51 (15%) denied the existence of segregation. However observations revealed that Segregation was applied only to sharps which was collected in special sharp boxes Furthermore 47 (13.8%) of the respondents do not use protective equipment when handling healthcare waste while majority of the respondents 293 (86.2%) have agreed to usage of protective equipment. The use of hands was identified as the most common mode of transportation as indicated 214 (62.9%) of the respondents while open pit burning was identified as the commonest method of waste disposal. Based on the study findings it was revealed that healthcare waste was improperly managed and majority of healthcare workers were not in compliance with Ugandans health workers guide.

Abstract. The subgrade soil is the foundation plate form of the roadway; it should sustain its structural characteristics throughout the design life of the roadway with minimal requirements for maintenance. When Gypseous soil is implemented in the construction of subgrade, problems regarding collapsibility and poor structural capacity usually occur when the subgrade came in touch with excess water. Asphalt stabilization could furnish a proper solution to such problems. In this investigation, an attempt has been made to monitor the variations in compressibility characteristics of asphalt stabilized subgrade soil subjected to 30 cycles of (freezing-thawing) and (heating-cooling). Data have been observed after each 10 cycles, and compared with that of reference mix. Specimens of (75) mm diameter and (20) mm height have been prepared at optimum fluid content with various asphalt emulsion percentages. Testing was carried out using the standard odometer to determine the compressibility characteristics at dry and soaked test conditions. It was concluded that for samples exposed to (10, 20 and 30) cycles of (freezing-thawing), the compression index (Cc) had increased with the increase of cycles in soaked condition but it decreases with increased number of cycles in dry condition. Initial void ratio decreased with number of cycles in dry condition; but remains constant with increased number of cycles in soaked condition. For samples exposed to (10, 20 and 30) cycles of (heating-cooling), (Cc) decreased with the increase of cycles in both soaked and dry condition. Initial void ratio increased with number of cycles while it slightly changed for dry and soaked condition respectively.

Abstract. El-Gedida high-Ba iron ore was subjected to microscopic, mineralogical and chemical characterizations followed by chemical leaching using HCl. The microscopic investigations revealed that the textural relationships between barite and iron minerals are complicated, resulting in a difficult liberation during the comminution process. XRD analysis of the studied ore indicated the presence of hematite and goethite as the dominant iron minerals and barite, quartz and halite as gangue minerals. Chemical assays using XRF showed that the investigated ore contains 42.29% Fe2O3 (29.58% Fe total), 36.99% BaO and 16.95% SO3. The pre-treatment operations involved crushing and milling up to -150μm particle size. The processing operation included chemical leaching of 15 gm representative sample of the ground ore using acidic medium of HCl at fixed agitation speed 900 r/m. The leaching was followed by filtration, solvent extraction and precipitation processes. The resultant dual concentrate is divided into iron fraction containing 66.11% Fe with 99.84% iron recovery and barite concentrate containing 66.85% BaO (99.81% recovery) and 30.53% SO3 (99.47% recovery). The resultant iron fraction is accepted as a blast furnace feed charge for the Egyptian Iron & Steel Company, while barite fraction can be used for the oil industry and glassmaking.

Abstract. Problematic soils present a difficult challenge for geotechnical engineering due to the high settlement of the soil structure and the often associated high water table and moisture content. The Deep Soil Mixing (DSM) method, which is a soil stabilization technique, has been commonly applied to improve Different parameters of soil. The application covers on-land and in-water constructions ranging from strengthening the foundation ground of buildings, embankment supports, earth retaining structures, retrofit and renovation of urban infrastructures, liquefaction hazards mitigation, man-made island constructions and seepage control. In this paper important parameters that effect in performance of deep soil mixing(DSM) and different design steps of DSM is examined. In this regard embankment investigates when use of DSM with finite element method. the results shows by increase of diameter and height of columns safety factor and settlement decrease but this parameters effects Up to a certain amount Then it is negligible Effect.

Abstract. This paper presents the development of a low frequency vibration energy harvester based on the electromagnetic principle integrated with low threshold voltage diode multiplier circuitry. The harvester is designed to be modular and scalable based on a single electromagnetic generator. In this design four individual generators are arranged in series. The dimension of the device is 75mm x 140mm x140mm. Experimental results showed that a peak open circuit voltage of 1.6 V at 10 Hz and 0.8g. Maximum power of 0.45 mW were extracted by the converter at resistive load of 5 kΩ. The power/acceleration density of the harvester is 600 μW/gcm3, which is the highest for any vibration energy harvester based on the electromagnetic principles reported.

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